Brush



July 7, 1931- G. w. Nar-WELL 1,813,076

BRUSH Filed April 15, 1929 attorno@ Patented July 7, 1931 UNITED. STATESGEORGE W. NEWELL, OF BURLINGTON, WISCONSIN BRUSH application med Aprn15,

This invention relates to tooth brushes and more particularly to brushesfor use in cleaning dental plates.

An object of the invention is to produce a brush which is constructedalong scientific lines so as to facilitate the cleaning of all parts ofa dental plate.

Other objects and advantages reside in certain novel features of theconstruction,

arrangement and combination of parts which will be hereinafter more fulldescribed and particularly pointed out 1n the appended claim, referencebeing had to the accompan ing drawings forming a part of thisspecificatlom-and in which:

Figure 1 is a plan view of a brush embodymg one form of the invention;

Figure 2fis a side view of the brush"of Fi re 1; Figures 3, 4, 5 and 6are cross sectional views on the lines 3 3, 4 4, 5 5 and 6 6,

respectively, of Figure .1; f

Figure 7 is a side view of a brush embodying another form oftheinvention; and

Figure 8 is a cross sectional view on the line 8 8 of Figure 7.

Referring to Figures 1 to 6, inclusive, of the drawings, the referencenumeral 1 desig' nates a handle of any suitable material.

The handlel is of the contour shown and has a U-shaped head portion atone endthereof, as viewed at the left of Figures 1 and 2. vThe centralportion of the handle is rectan` gular in cross section, as shown inFigure 6,

and the right hand end is circular in cross section, as shown in Figure5.

Both the convex surface 2 and concave surface 3 of the U-sha ed headportion of the handle are provide with bristles, these bristles beingsecured to the handle in any Well known manner. The bristles on theconvex surface` are designated at 4 and those on the concave surface at5. As best shown in Figure 2, the vlower surface of the U-shaped headportion is curved upwardly so as to provide. a surface of somewhatspherical shape. This surface is completely covered by the bristles 4and is of such a shape that the radius of curvature of the bristles isapproximately equal to that of the y 1929. Serial N0. 355,113.

intermediate or central portion of a dental plate. The bristles 4 arethus -Well adapted for brushing the underside of the plate.

The contour of the bristles 5 is of considerably less diameter than thatof the bristles 4 so as to adapt this portion of the lbrush to be usedfor simultaneously cleaning ythe sides and the top of teeth on a dentalplate.

Adjacent the head portion of the brush, the handle is inclined slightlyupward as shown at 6. This part of the handle serves as a guide-way andcauses a slight change in the angular relation between the teeth and thebristles 5 as the teeth are moved horizontally with respect to the vbrush.

The right yhand end portion 7 of the brush, shown in Figures 1 and 2, iscurved over an arc of approximately 90 as shown, and is provided withbristles 8 extending over the entire curved portion and completelycovering the sides as well as the end thereof. The bristles on this endof the brush are so disposed as to t into and properly clean thedepressions between the teeth and the central or intermediate portion ofa dental late.

The modified orm of Figures 7 and 8 is similar to that of the preferredembodiment of the invention described above except that the right handportion 10 of the handle is rectangular in cross section and fthebristles 11 thereof are disposed on only two opposite sides thereof.

It will be seen that brushes constructed along the lines described aboveare well adapted to clean all parts of a dental plate. i

vU-shaped vbrush head being offset with respec't. to the handle, and aset of bristles projecting outwardly from the outer wall of the U-shapedhead, the inner wall of the U-shapledv head also being adapted to'carryling a set of inwardly directed bristles.

In witness whereof, I hereto aix my signature.

. GEORGE W. NEWELL.

